{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"HIGH" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Defer work in bpf_timer_cancel_and_free\n\nCurrently, the same case as previous patch (two timer callbacks trying\nto cancel each other) can be invoked through bpf_map_update_elem as\nwell, or more precisely, freeing map elements containing timers. Since\nthis relies on hrtimer_cancel as well, it is prone to the same deadlock\nsituation as the previous patch.\n\nIt would be sufficient to use hrtimer_try_to_cancel to fix this problem,\nas the timer cannot be enqueued after async_cancel_and_free. Once\nasync_cancel_and_free has been done, the timer must be reinitialized\nbefore it can be armed again. The callback running in parallel trying to\narm the timer will fail, and freeing bpf_hrtimer without waiting is\nsufficient (given kfree_rcu), and bpf_timer_cb will return\nHRTIMER_NORESTART, preventing the timer from being rearmed again.\n\nHowever, there exists a UAF scenario where the callback arms the timer\nbefore entering this function, such that if cancellation fails (due to\ntimer callback invoking this routine, or the target timer callback\nrunning concurrently). In such a case, if the timer expiration is\nsignificantly far in the future, the RCU grace period expiration\nhappening before it will free the bpf_hrtimer state and along with it\nthe struct hrtimer, that is enqueued.\n\nHence, it is clear cancellation needs to occur after\nasync_cancel_and_free, and yet it cannot be done inline due to deadlock\nissues. We thus modify bpf_timer_cancel_and_free to defer work to the\nglobal workqueue, adding a work_struct alongside rcu_head (both used at\n_different_ points of time, so can share space).\n\nUpdate existing code comments to reflect the new state of affairs.", "category":"general", "title":"Synopsis" } ], "publisher":{ "issuing_authority":"openEuler security committee", "name":"openEuler", "namespace":"https://www.openeuler.org", "contact_details":"openeuler-security@openeuler.org", "category":"vendor" }, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2024-41045" }, { "summary":"CVE-2024-41045 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2024/csaf-openeuler-cve-2024-41045.json" }, { "summary":"openEuler-SA-2024-1960", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-1960" }, { "summary":"CVE-2024-41045", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2024-41045&packageName=kernel" } ], "title":"openEuler cve CVE-2024-41045", "tracking":{ "initial_release_date":"2024-08-09T21:03:11+08:00", "revision_history":[ { "date":"2024-08-09T21:03:11+08:00", "summary":"Initial", "number":"1.0.0" }, { "date":"2024-08-13T10:03:00+08:00", "summary":"Current version", "number":"2.0.0" }, { "date":"2024-08-19T17:36:01+08:00", "summary":"Current version", "number":"3.0.0" } ], "generator":{ "date":"2024-08-19T17:36:01+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2024-08-19T17:36:01+08:00", "id":"CVE-2024-41045", "version":"3.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:24.03-LTS" }, "product_id":"openEuler-24.03-LTS", "name":"openEuler-24.03-LTS" }, 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previous patch (two timer callbacks trying\nto cancel each other) can be invoked through bpf_map_update_elem as\nwell, or more precisely, freeing map elements containing timers. Since\nthis relies on hrtimer_cancel as well, it is prone to the same deadlock\nsituation as the previous patch.\n\nIt would be sufficient to use hrtimer_try_to_cancel to fix this problem,\nas the timer cannot be enqueued after async_cancel_and_free. Once\nasync_cancel_and_free has been done, the timer must be reinitialized\nbefore it can be armed again. The callback running in parallel trying to\narm the timer will fail, and freeing bpf_hrtimer without waiting is\nsufficient (given kfree_rcu), and bpf_timer_cb will return\nHRTIMER_NORESTART, preventing the timer from being rearmed again.\n\nHowever, there exists a UAF scenario where the callback arms the timer\nbefore entering this function, such that if cancellation fails (due to\ntimer callback invoking this routine, or the target timer callback\nrunning concurrently). In such a case, if the timer expiration is\nsignificantly far in the future, the RCU grace period expiration\nhappening before it will free the bpf_hrtimer state and along with it\nthe struct hrtimer, that is enqueued.\n\nHence, it is clear cancellation needs to occur after\nasync_cancel_and_free, and yet it cannot be done inline due to deadlock\nissues. We thus modify bpf_timer_cancel_and_free to defer work to the\nglobal workqueue, adding a work_struct alongside rcu_head (both used at\n_different_ points of time, so can share space).\n\nUpdate existing code comments to reflect the new state of affairs.", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-24.03-LTS:bpftool-6.6.0-37.0.0.44.oe2403.aarch64", "openEuler-24.03-LTS:bpftool-debuginfo-6.6.0-37.0.0.44.oe2403.aarch64", "openEuler-24.03-LTS:kernel-6.6.0-37.0.0.44.oe2403.aarch64", "openEuler-24.03-LTS:kernel-debuginfo-6.6.0-37.0.0.44.oe2403.aarch64", "openEuler-24.03-LTS:kernel-debugsource-6.6.0-37.0.0.44.oe2403.aarch64", "openEuler-24.03-LTS:kernel-devel-6.6.0-37.0.0.44.oe2403.aarch64", "openEuler-24.03-LTS:kernel-headers-6.6.0-37.0.0.44.oe2403.aarch64", "openEuler-24.03-LTS:kernel-source-6.6.0-37.0.0.44.oe2403.aarch64", "openEuler-24.03-LTS:kernel-tools-6.6.0-37.0.0.44.oe2403.aarch64", 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"openEuler-24.03-LTS:perf-debuginfo-6.6.0-37.0.0.44.oe2403.x86_64", "openEuler-24.03-LTS:python3-perf-6.6.0-37.0.0.44.oe2403.x86_64", "openEuler-24.03-LTS:python3-perf-debuginfo-6.6.0-37.0.0.44.oe2403.x86_64", "openEuler-24.03-LTS:kernel-6.6.0-37.0.0.44.oe2403.src" ] } ], "threats":[ { "details":"Medium", "category":"impact" } ], "title":"CVE-2024-41045" } ] }